// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.apache.doris.qe.protocol;

import com.google.protobuf.ByteString;
import com.google.protobuf.UnsafeByteOperations;
import org.apache.thrift.TBase;
import org.apache.thrift.TConfiguration;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.protocol.TProtocolFactory;
import org.apache.thrift.transport.TIOStreamTransport;
import org.apache.thrift.transport.TTransportException;

import java.io.ByteArrayOutputStream;

/**
 * Copy from TSerializer and support change the initial byte array capacity
 */
public class TFastSerializer {

    /**
     * This is the byte array that data is actually serialized into
     */
    // private final NoResizeByteOutputStream baos;
    private final ByteArrayOutputStream baos;

    /**
     * This transport wraps that byte array
     */
    private final TIOStreamTransport transport;

    /**
     * Internal protocol used for serializing objects.
     */
    private TProtocol protocol;

    /**
     * Create a new TSerializer. It will use the TProtocol specified by the
     * factory that is passed in.
     *
     * @param initCapacity init capacity to the write buffer
     * @param protocolFactory Factory to create a protocol
     * @throws TTransportException if there an error initializing the underlying transport.
     */
    public TFastSerializer(int initCapacity, TProtocolFactory protocolFactory) throws TTransportException {
        baos = new ByteArrayOutputStream(initCapacity);
        transport = new TIOStreamTransport(new TConfiguration(), baos);
        protocol = protocolFactory.getProtocol(transport);
    }

    /**
     * Serialize the Thrift object into a byte array. The process is simple,
     * just clear the byte array output, write the object into it, and grab the
     * raw bytes.
     *
     * @param base The object to serialize
     * @return Serialized object in byte[] format
     * @throws TException if an error is encountered during serialization.
     */
    public ByteString serialize(TBase base) throws TException {
        baos.reset();
        base.write(protocol);
        return UnsafeByteOperations.unsafeWrap(baos.toByteArray());
    }

    /**
     * Serialize the Thrift object into a Java string, using the default JVM
     * charset encoding.
     *
     * @param base The object to serialize
     * @return Serialized object as a String
     * @throws TException if an error is encountered during serialization.
     */
    public String toString(TBase base) throws TException {
        return new String(serialize(base).toByteArray());
    }
}

